Smudging is a ceremony practiced by some Indigenous peoples of the Americas, that involves the burning of sacred herbs, in some cases for spiritual cleansing or blessing. While the particulars of the ceremonies, and the herbs used can vary widely between tribes and nations, many use forms of sage (for example, common sage or white sage) and cedar that is local to their region.
How to Smudge:
Move in a clockwise direction around your house (usually starting at the front door), and gently wave the smoke into the air. Spend a bit more time smudging the room corners, as they tend to accumulate stagnant energy. Be sure to also open the closet doors and carefully smudge inside. Do not forget about spaces such as the laundry room, the garage, and the basement.